In case you don’t feel like watching the whole video, this is what we learned…
1. The Man in Black’s name was Samuel, which means Man of God.
2. The person in the cabin that said “Help me” to Locke was the MIB in Christian Shephard’s form.
3. We will find out what happened to Walt on the DVD.
4. Jin was the Kwon on the cave ceiling (which I figured since Sun was a mother, which means she would have been crossed off)
5. The 108 in the Lighthouse was not important – that scene was merely to get Jack to the Lighthouse, and the number 108 held significance for the characters, so it got them to go.
6. The shot of the plane over the credits at the end was just B-roll of the original crash from Season 1 (I think it was just a little homage to the beach and the crash – I’ve heard some places didn’t see that image, which makes me think I’m right about this one.)
7. The Protector of the Island can change the weather, sometimes unconsciously, hence why Jack and Smokey fighting on the cliff was stormy, but as soon as he was gone, it was sunny again.